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        <p>ElasticSearch是一个基于Lucene的搜索服务器。它提供了一个分布式多用户能力的全文搜索引擎，基于RESTful web接口。是基于Java开发，目前比较流行的企业级搜索引擎。<br>我们先来在Linux下安装一这个搜索引擎</p>
<h2 id="1、下载Elasticsearch（版本：6-1-0）"><a href="#1、下载Elasticsearch（版本：6-1-0）" class="headerlink" title="1、下载Elasticsearch（版本：6.1.0）"></a>1、下载Elasticsearch（版本：6.1.0）</h2><p>在<a href="https://www.elastic.co/downloads/elasticsearch" target="_blank" rel="external">Elasticsearch官网下载</a> 可选择对应的下载文件</p>
<p>Linux环境下，可通过如下步骤进行 (安装)[<a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/zip-targz.html#setup-installation-daemon" target="_blank" rel="external">https://www.elastic.co/guide/en/elasticsearch/reference/current/zip-targz.html#setup-installation-daemon</a>]<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.0.1.zip</span><br><span class="line">unzip elasticsearch-6.0.1.zip</span><br></pre></td></tr></table></figure></p>
<p>或<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.0.1.tar.gz</span><br><span class="line">tar -xzf elasticsearch-6.0.1.tar.gz</span><br></pre></td></tr></table></figure></p>
<h2 id="2、Elasticsearch运行环境"><a href="#2、Elasticsearch运行环境" class="headerlink" title="2、Elasticsearch运行环境"></a>2、Elasticsearch运行环境</h2><p>在官网下载的最新版本的Elasticsearch6.0最低需要jdk版本为1.8，但在服务器上，应用运行的环境都在1.7上，所以运行Elasticsearch出现异常：如何指定Elasticsearch运行时java呢？<br>在Elasticsearch目录下，bin/elasticsearch-env文件中，配置了Elasticsearch运行时jdk的路径。默认是$JAVA_HOME 使用系统配置的java路径，我们修改一下这个配置文件<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">#添加Elasticsearch运行时java路径参数</span><br><span class="line">ELS_JAVA_HOME=&quot;/usr/local/els/java/jdk1.8&quot; </span><br><span class="line">#修改配置文件 将所有$JAVA_HOME 替换成 $ELS_JAVA_HOME</span><br></pre></td></tr></table></figure></p>
<h2 id="3、配好Elasticsearch运行时"><a href="#3、配好Elasticsearch运行时" class="headerlink" title="3、配好Elasticsearch运行时"></a>3、配好Elasticsearch运行时</h2><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">./bin elasticsearch</span><br></pre></td></tr></table></figure>
<p>出错<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">org.elasticsearch.bootstrap.StartupException: java.lang.RuntimeException: can not run elasticsearch as root</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:134) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:121) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:69) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">Caused by: java.lang.RuntimeException: can not run elasticsearch as root</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:104) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:171) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:322) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:130) ~[elasticsearch-6.0.1.jar:6.0.1]</span><br><span class="line">        ... 6 more</span><br></pre></td></tr></table></figure></p>
<p>很明显这个是因为安全性问题，Elasticsearch不允许使用root用户运行, 那我们新建一个用户用于运行Elasticsearch<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">groupadd elasticsearch #新建用户组</span><br><span class="line">useradd elasticsearch -g elasticsearch -p elasticsearch #新建用户，并为用户添加组合密码</span><br><span class="line">chown -R elasticsearch:elasticsearch /usr/local/els/elasticsearch-6.0.1 # 为用户添加运行Elasticsearch的权限</span><br></pre></td></tr></table></figure></p>
<p>至此我们再次运行发现仍然报错：</p>
<figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">java.lang.UnsupportedOperationException: seccomp unavailable: requires kernel 3.5+ with CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER compiled in</span><br><span class="line">        at org.elasticsearch.bootstrap.Seccomp.linuxImpl(Seccomp.java:349) ~[elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Seccomp.init(Seccomp.java:630) ~[elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.JNANatives.trySeccomp(JNANatives.java:215) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Natives.trySeccomp(Natives.java:99) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:101) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:155) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:286) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:112) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:103) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:96) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.cli.Command.main(Command.java:62) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) [elasticsearch-5.0.0.jar:5.0.0]</span><br><span class="line">        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:73) [elasticsearch-5.0.0.jar:5.0.0]</span><br></pre></td></tr></table></figure>
<p>然后发现这个问题，并不是一个Error，而是一个Warn。因此我们可以忽略。眼不见心不烦么，我们把Elasticsea在后台运行，就发现不了这个Warn了<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">./bin/elasticsearch -d</span><br></pre></td></tr></table></figure></p>
<h2 id="4、验证一下"><a href="#4、验证一下" class="headerlink" title="4、验证一下"></a>4、验证一下</h2><p>默认Elasticsearch启动后占用系统的9200端口<br><figure class="highlight plain"><table><tr><td class="code"><pre><span class="line">curl http://localhost:9200/</span><br><span class="line"></span><br><span class="line">&#123;</span><br><span class="line">  &quot;name&quot; : &quot;S9bB4ga&quot;,</span><br><span class="line">  &quot;cluster_name&quot; : &quot;elasticsearch&quot;,</span><br><span class="line">  &quot;cluster_uuid&quot; : &quot;9j-VqVVCRmGWKX8RgXlNsQ&quot;,</span><br><span class="line">  &quot;version&quot; : &#123;</span><br><span class="line">    &quot;number&quot; : &quot;6.0.1&quot;,</span><br><span class="line">    &quot;build_hash&quot; : &quot;601be4a&quot;,</span><br><span class="line">    &quot;build_date&quot; : &quot;2017-12-04T09:29:09.525Z&quot;,</span><br><span class="line">    &quot;build_snapshot&quot; : false,</span><br><span class="line">    &quot;lucene_version&quot; : &quot;7.0.1&quot;,</span><br><span class="line">    &quot;minimum_wire_compatibility_version&quot; : &quot;5.6.0&quot;,</span><br><span class="line">    &quot;minimum_index_compatibility_version&quot; : &quot;5.0.0&quot;</span><br><span class="line">  &#125;,</span><br><span class="line">  &quot;tagline&quot; : &quot;You Know, for Search&quot;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<blockquote>
<p>参考：</p>
</blockquote>
<p><a href="https://discuss.elastic.co/t/java-lang-unsupportedoperationexception-on-starting-elasticsearch/64548" target="_blank" rel="external">关于Elasticsearch警告</a></p>

      
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